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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82282b571b7616fcf820ddf772ae2351709690903251b8aa61174553dfada1c' 
  AND token = 'uq5shYAm1MUtO22kXX3bao0da+9jMWWr1ChrHwqMOFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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