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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e152f949de89f13ad279114192f1f575a16759a5c0f6f7d9849f4cd57248c2' 
  AND token = '0SWQ/xoDtTfp7ORdyU35puziDZ+CEk6pfQD1SBMqcyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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