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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c10e205bdc9185c04b5c65e848bc181acf762bfc4e42cbceffba799de08e6bd' 
  AND token = 'OXGdsMq8ZG14z33iWi/AGItVz9vFIV06NRMmWnj1Q3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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