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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870b0333a2e9884528746c840f01174fff76a099096d21bfa9738d7ce7326de5' 
  AND token = 'SSOzYLWHtG5RMoABs9KK9McFuhy6x68pNBcZ42OW3Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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