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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2239795e4727af63f3373060a0853be07c8b0e2b12cca501ee41c68884ff1aea' 
  AND token = 'Sm0GRfn05/MSOk+FOLiE5YpK7k2l+upY6gEERjf1pcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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