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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760c560c79594123c63be47b4ac508c31932f0934e4efb4a3366feb48b4fefef' 
  AND token = 'OiW53br9pzSHFS8NIxHmiqA05RcjvvkneEdGRzWo/I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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