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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b67835c13c9e69fbe3e152715107f6ec594a5b346629acedb49847b37ae8e31' 
  AND token = 'm0fJnVEPVvSJB/c1TYLD1zjQr8tk41e6qQNXr3piLLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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