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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bc647ffad5eed9dce4be4eeec9470147ca01b52fad24963c2b1c04359146c4' 
  AND token = 'JAX1YHfWtlYz5DVFkFw8nf0rOxhbV4dy1Vj3itA2YBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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