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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d14b07beabd5a12c2be8507df39b4da0ce7a5eb9c9d80899e861aebffc50dfc' 
  AND token = '/KYCgDauWCXN/1zUVtqYmey+wszLyAAwv28XFFVT7ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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