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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bb0f286a89f6ddd951115f36ad0220c8eb9fcac11149ebc59b2a98fbe3e3cd' 
  AND token = 'o6a4jrmGMEhfCaczChM9CvFfSGnkL6BskBcWPHPLzq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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