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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a9135c93fa312186659f16d2e42ea801afcbcb3031b4071de7e8051e9a712e' 
  AND token = 'O9Oce8wUbx3ecRxf99ws0gqTDU28sg8C8IzwkHofF6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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