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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a58d27a0ce1c43e05a2e157bb29155d93d8880561d2cc32be45be7ae970db5e' 
  AND token = '37TMOtR5YvY6E7d0j1Hjl1qRKtjq2vGZLYunKrICc90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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