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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8694fae7775ed3b840ea9bded355d7c359e51b7a16461f44de88d90aa61fe32' 
  AND token = 'BTX+wIAfzSO7HzWyVllgG3oWB9T54Aqn+ZGo16rZ61o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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