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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0030cb7532d6409eabf52e86f8106231d68e52fe4331c105a4d6538c10418d5' 
  AND token = 'RgemR+5nQH34Ve0jeK83tLdIY+sYMUqmeg95QoFw694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}