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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783285b7fd34bed97612bf7c40ecc0c119f717ac4710c29d4eb70174272945a9' 
  AND token = 'lMERJ+S/buDyTSIAZFQ1cQHFHjb4TT0J1Paos3ADC/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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