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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1833ac05a642ec120f8c77c4928504daeb1d2ae677daf92b27a87a11af2c8dea' 
  AND token = 'Qm8SW2zF4H2LRx+3Z8hwnx0dT23vsEt293uvY6WosVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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