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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea5b7b413d60e627ca6f42490ea5d055693bf303e65ba93de837888792d7572' 
  AND token = 'S0ZBMkiFLcJbGQHoEiPn3662fmb/poHflz9t2W2QH2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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