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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51600aed1c7f308699b33c55468fcf9e80809e498951ef0895998dcb2c5e1dd' 
  AND token = 'bZPJhJ9sqXYVOTPcb2KB6vUVNGZQ9fBirFr7xuSE0G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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