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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b4a3c1daff7972f5ac860e99adcbdbbc068bfa7e6d7facfe8ada955f921f12' 
  AND token = 'FI6mS14cvLlw7QLMFknhx7DaFqy83ZuwEOl6YIRvw0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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