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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ebb6b7a2464e7de30f4fa33f16f5b96e7054dc4e53c9946e7d6c3f54726dd7' 
  AND token = 'qbz2bkWIljxTMamxnG9z9/KNP5jpgWKloTWT5QZJW5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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