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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68b7bcc7eb74fd94b01ee1c1d5b952b6c97715e1b82d4f384f031ad6df44f27' 
  AND token = 'ws5/jB3nEhvqr4MVWY1oAAcmLMbVe+udcArm4H1q4yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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