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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93f9e55616fc748d5764ffb29b34abad8fa7f2b0c4aa5ebc650212ec2540e3c' 
  AND token = 'ZKR9h14vYSk79ABTJJh8acqf2KqayY62CAWtUUPyuj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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