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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc09d466d7fad91961ec3119709fc7350db1fed00409c72cc875c6a09f2006d' 
  AND token = 'EDjIbzBNjMQ6XUX3J+BFmMqfTGTGIQB/NOCSldi3lvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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