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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de40164a63b60206c174e2bba8663f154ab2bd9c31032bee088934cbce5b70d' 
  AND token = 'wBrTbDzjLYZTAghykWzi8AXp+BE3DW4orRAwEALGEHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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