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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8413f03c55647e43734ef5fce305dd5779ad4ca114c4ec01d72f862fca61acee' 
  AND token = '9xyGDbHjXft2lw1zKFNDj7IwZ7oPZYZEvawYfe7EKTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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