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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f047c47e1188912b2cf4028929d50df7ea9771d8a33eb2bc26c762dbc2e42884' 
  AND token = 'SQtiSjWzzUUYmwaEsYrwyN3Uk3AVei1XUlSkXKRVCOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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