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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adef039e357a5dacf6c3245c77d30e86d6f01d10c92251069871a1f83e97486' 
  AND token = 'oqT29YBPjHzOYjF3iTpSfE8Ermp1D1ujbgatkm4OGgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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