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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69978da1ebd692d25458aa6f9182b4f245e1b83d69ff8b2a2fd73b29d2694a0' 
  AND token = 'kndGhk8EBVz7XOtX79yV48WT8nWY8hRKz8h3lKiCHbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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