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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72b0b8aa6054542b67cefc80e7235cd16b926e7d4a6cd2554405b291eb4123b' 
  AND token = 'cUlTnRLKIla+9JsBVdcfnb6qFqLo9w5D42UfcTu9uVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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