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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2f4058630257b3f3b9307593ae199ac0602b5c0f7c7ec76dacd883b52eefeb' 
  AND token = 'd+7OvjLhBePnaWDURRNLm+R07j07ImyxFUU36US30L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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