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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2370125449502485c8e36ee105eef9437cc241a22edcfd497641351775631e04' 
  AND token = '8aGrVFQ80hO0LudvAbLCo21vGgAsmVjwYOw+pAd4Ee0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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