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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5548e9816a36a099c9b5b7131ecb6a2dae29b9d01c4a5ef05bab9f3c2b6c91d5' 
  AND token = 'zJAcgjuStegdaWArVwSU1X2P5cQUEXuktlMkh8WXCe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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