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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b01f81d51229d97d7ddeacbad841e692880b8da8bf613f2d9e6a50203446cf7' 
  AND token = 'qasOLbXeLIfxSZReTggCAF7dZ1xh96PReEpLaklcL/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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