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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6abb3011a93ed5a6aed3afe99a38302e81e84c8a282fe3baee94d320b5767d' 
  AND token = '1r09XBJ3ntjVmEEEiTKWWHmig0muBLjz09Bx2KuOk0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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