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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87c7382a7bbd2dd3fb183cfa26116fb0a8e4bb877d5fc7c5e6ed381a2a84d2a' 
  AND token = 'D3AcaUIGhlieyB3aQmRnFmyZMPqijIXhOflsRpYQd/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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