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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267d15cbb972ee8710ce09953df9264cd0e61d4f1777a6018de04a122ded825f' 
  AND token = 'wbJgiSfJsOhNVhvwjOEUj202nCX1OX0uOXqEd569KSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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