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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5c3ff2561cd11ca96cbd34e084d6d51f8c7128a4dbd168020a2ee0eee048a5' 
  AND token = '+koOn4Zso3juFbAmBOXMyxtSgG9gSvwJ3lIRE2OVt7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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