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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3df80cfa46e5e3088b955998cf8f8b3a3cb92592b916eff6d6a64e4623d043' 
  AND token = 'VDkBlI9T4xT1p22AxDdtTc87f+EChzAA+K++YYvGI3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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