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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35faabf1ea2e01327478ed82866255bde0289a6aae01ab7c8a051c4c76fecb3b' 
  AND token = '0uzCLtt7E2kkgyTDB42aQ8uqqxoFo07VtJHF8xkRWfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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