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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874846294325693ca83d394927ca517ee2fd6bc0aacc3c7549422e16f4ed614e' 
  AND token = '0jm2w0j96gxrd6EnYYXx9urXEamNfQ1fc1uy5mFuz/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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