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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9919d4d2d9b0e7d59d7453a50d5ad96cb64d4ffe5851fac94cc121af38fba99' 
  AND token = '7+Z+7SPVwzm0VYb59fBymgICXJrEmov0wMnyONpU5v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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